New management at a Long Island Costco was so cruel to a longtime employee with Tourette’s syndrome that he had to be hospitalized over the incessant taunting, according to a new lawsuit.

Christopher Fox, 38, who has worked at the Holbrook store since age 19, triumphed over his condition, writing a book, performing comedy on YouTube and speaking to schoolchildren, according to his Brooklyn federal-court suit.

“I was mocked because of my vocal tic,” Fox told The Post.

He also learned to compliment customers when he felt the urge to shout out expletives. But in 2013, when new managers Larry Resnikoff and Glenn Johnson were hired, everything changed.

The supervisors looked the other way when co-workers yelled “hut-hut-hut” at Fox, mimicking his uncontrollable grunts, the suit says.

Resnikoff also told Fox to his face, “I cringe every time I walk by you,” according to court papers.

The “unabated harassment, scrutiny and ridicule [were] so severe that it sent his disabilities into a tailspin” and Fox was rushed to a hospital last November, the suit says.

“With all the harassment I just had a breaking point,” Fox told The Post.

“I was diagnosed with a panic attack. The doctor said I should see a therapist.”

Fox is seeking unspecified damages and is currently on-leave from the nation’s second largest retailer.

“I just don’t feel safe there,” said the married author of “How God Saved Me: My Inspirational Life Story.”